xtest18_4.c

AT91sam7s 256 B/D example

/* ========================================================================== */
/*		Xtest18_4.c : Idle Mode and Watchdog Timer(2)		      */
/* ========================================================================== */
/*			  Designed and programmed by Duck-Yong Yoon in 2007.  */

#include "AT91SAM7S256.h"
#include "lib_AT91SAM7S256.h"
#include "OK7S256ads.h"

void WDT_ISR(void)				/* WDT interrupt service routine */
{
  AT91F_WDTSGettatus(AT91C_BASE_WDTC);		// clear WDUNF

  LCD_string(0xC0," WDT Interrupt !");		// display interrupt
  Beep();
  Delay_ms(1000);
  LCD_string(0xC0,"Now, sleep mode!");		// display sleep mode
}

int main(void)
{
  MCU_initialize();				// initialize AT91SAM7S256 & kit
  Delay_ms(50);					// wait for system stabilization
  LCD_initialize();				// initialize text LCD module

  LCD_string(0x80," OK-7S256  V1.0 ");		// display title
  LCD_string(0xC0," Watchdog Reset ");
  Beep();

  LED_on(LED2 | LED1);				// blink LED2 and LED1
  Delay_ms(1000);
  LED_off(LED2 | LED1);
  LCD_string(0xC0,"Now, sleep mode!");		// display sleep mode

  AT91F_WDTC_CfgPMC();				// enable peripheral clock for WDT
  *AT91C_WDTC_WDMR = 0x10001000 | (1280 << 16) | 1280; // enable watchdog interrupt
						// WDD=WDV=1280 for 5 sec

  AT91F_AIC_ConfigureIt(AT91C_BASE_AIC,AT91C_ID_SYS,7,1,WDT_ISR); // enable interrupt
  AT91F_AIC_EnableIt(AT91C_BASE_AIC,AT91C_ID_SYS);

  while(1)					// blink LED2 and LED1
    { AT91F_PMC_CfgSysClkDisableReg(AT91C_BASE_PMC,AT91C_PMC_PCK); // go in idle mode

      LED_off(LED2); LED_on(LED1);
      Delay_ms(100);
      LED_on(LED2);  LED_off(LED1);
      Delay_ms(100);
    }
}